[SunHELP] can't login

[Limor Hevroni]

Hi,
I have following problem in Solaris2.6 station:
I can't login with any user except to root!
my .dt/startlog file says the following:
Xsession starting ...
starting speckeysd
fbconsole: grantpt failed
xsession started by dtlogin
starting dtsession_res -load -system
sourcing ...
:
:
sourcing ...
exec dtsession with tcsh login shell
grantpt: Error 0
unable to get pty: Error 0

any idea what could lead to this situation and what can I do login again ?
I can't login either to CDE and to open windows (mwm) ..
10x, with regards 

limor hevrony
Orckit Communications Ltd.
058-356485 03-6945436